I filled my Rib up at the petrol station the other day and I usually carry one 25 litre tank and an extra 5 litres in a small can. I filled up the 25 and then switched to the 5 aiming to get it all on one bill but the berk on the checkout reset the pump after the first lot so the thirty litres came to about £4.20 !
I went in with my five pound note with a grin as wide as the M25 looking all pleased with myself but he had noticed so he had to add the two amounts in his head (which took some time)! I think there is some way of recalling the previous amount so it would be near impossible to get away with it.

Had the opposite in that a jerry can that had held diesel was filled with unleaded and then used to fill the tank for a Yamaha 50. Can't remember which way round it is, but either because it is heavier than petrol and the tank fed from bottom or is lighter and tank fed from top, the engine smoked loads then finally clogged up from being over oiled. Took a dam good stripdown and clean to get it running again.
Cheers,
Andy.
z

Last year I put £65 worth in the RIB and went to pay. The girl looked at me very stangly when I said "Pump 3".
"That chap out there has just paid for pump 3" she said "Oh, he only wanted a street map"
The silly sod signed his car slip for £65 rather than about £4.50.
Took a while to sort that lot out.
Moral of the story is - Check the amount on the credit card slip BEFORE signing it.

__________________Mark H"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams

Had the opposite in that a jerry can that had held diesel was filled with unleaded and then used to fill the tank for a Yamaha 50. Can't remember which way round it is, but either because it is heavier than petrol and the tank fed from bottom or is lighter and tank fed from top, the engine smoked loads then finally clogged up from being over oiled. Took a dam good stripdown and clean to get it running again.
Cheers,
Andy.
z

So is this why you've not been out and about lately then Andy

Outboards seem to be far more delicate than any other type of machinery, dirt, water, oil petrol, over oil, under oil etc will all effect the engine in different ways....normally not good.

I have used my 22l jerrycans for both petrol and diesel one after the other with no problems for either my diesel car or 2 stroke boat so far.
The minor amount left when empty when diluted by 22l of the other substance doesn't seem to cause any problems.